Adjusting Rain Clutter; Setting Offset; Range Measurement - JRC RADAR 1800 Instruction Manual

Adjusting RAIN CLUTTER

• Press the until RAIN is highlighted in the upper right
Jog Dial
corner of the display. Rotate the
counterclockwise, to vary the level and thus control the strength of
echoes returned from rain or snow.
An on-screen bar indicates the rain level selected. As you rotate
clockwise, the returned echoes will become narrower and the returns
from rain or snow will be reduced.

Setting OFFSET

• By pressing the
CENTER CENTER
1/3 of the range scale. Pressing
will restore the picture to the original centered display.

Range Measurement

q Count the number of range scale rings in use between the center of
the screen and the ring preceding the target. Add to this distance
between this nearest ring and the inner edge of the target.
w Using VRM
• Press the
EBL/VRM EBL/VRM
key to change the hiliter to VRM mode and activate the
EBL/VRM EBL/VRM
dashed circular VRM ring.
Rotate the
Jog Dial
increase it's range or counterclockwise to decrease it's range. The
actual target distance from the ship appears on the center top of
the screen in Radar full screen mode, or on the right side in
Radar/Chart screen mode. To turn off the VRM, press
while VRM is hilited.
e Using cursor
The cross mark can be moved any direction by using the
The cursor position (L/L), bearing and distance are displayed in
the bottom of the screen in radar full mode, or in the upper right
corner of the chart screen in split mode.
Unit of distance
• You can select a pair of speed and distance unit between KTS&NM,
KPH&KM, and MPH&SM. (Refer to p.100)
clockwise or
Jog Dial
key, the picture will be offset backwards by
again or switching modes
CENTER CENTER
key. If EBL is hilited, press and hold the
clockwise to expand the VRM ring and
EBL/VRM EBL/VRM
.
Joystick
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